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Expressing sin^6 q in the form a + bcos 2q + ccos 4q + dcos 6q using De Moivre's watch

1. where a, b, c, d are constants to be found.

2. use the z+1/z and z-1/z relation
3. (Original post by cpdavis)
use the z+1/z and z-1/z relation
Sorry but it's not the book, could you elaborate?

Can you see what to do from there?
5. ok, sorry for being brief

from de movires therom, we are able to state that z-1/z=sin (theta)

http://store.aqa.org.uk/qual/pdf/AQA-MFP2-TEXTBOOK.PDF

P63

hope it helps
6. (Original post by soutioirsim)

Can you see what to do from there?
..
7. (Original post by cpdavis)
ok, sorry for being brief

from de movires therom, we are able to state that z-1/z=sin (theta)

http://store.aqa.org.uk/qual/pdf/AQA-MFP2-TEXTBOOK.PDF

P63

hope it helps
Thank you

8. Remember, it's and not just - forgetting this could have apocalyptic consequences.

Edit: Where ...
9. Someone should also really mention what you're defining z to be, too. If the OPs never seen this before then making him guess like that is a little cruel.

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